Variable speed belt drive



FIG. 1 is a reduced perspective view of a variable speed belt drive embodying our new design;

FIG. 2 is a reduced perspective view of the side opposite the side shown in FIG. 1;

FIG. 3 is a top plan view;

FIG. 4 is an elevational view of the side shown in FIG. 2; and

FIG. 5 is an elevational view of the end seen in FIG. 1.

A mounting structure for a motor for driving the variable speed belt drive is partially shown in broken lines in FIGS. 1, 2 and 3, and forms no part of the inventive design. 

The ornamental design for a variable speed belt drive, substantially as shown and described. 